[lttng-tools.git] / src / bin / lttng / uprobe.cpp

/*
 * Copyright (C) 2020 EfficiOS, Inc.
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 */

#include "uprobe.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

#include "common/compat/getenv.h"
#include "common/string-utils/string-utils.h"
#include "common/utils.h"
#include "lttng/constant.h"

#include "command.h"

/*
 * Walk the directories in the PATH environment variable to find the target
 * binary passed as parameter.
 *
 * On success, the full path of the binary is copied in binary_full_path out
 * parameter. This buffer is allocated by the caller and must be at least
 * LTTNG_PATH_MAX bytes long.
 * On failure, returns -1;
 */
static
int walk_command_search_path(const char *binary, char *binary_full_path)
{
	char *tentative_binary_path = NULL;
	char *command_search_path = NULL;
	char *curr_search_dir_end = NULL;
	char *curr_search_dir = NULL;
	struct stat stat_output;
	int ret = 0;

	command_search_path = lttng_secure_getenv("PATH");
	if (!command_search_path) {
		ret = -1;
		goto end;
	}

	/*
	 * Duplicate the $PATH string as the char pointer returned by getenv() should
	 * not be modified.
	 */
	command_search_path = strdup(command_search_path);
	if (!command_search_path) {
		ret = -1;
		goto end;
	}

	/*
	 * This char array is used to concatenate path to binary to look for
	 * the binary.
	 */
	tentative_binary_path = (char *) zmalloc(LTTNG_PATH_MAX * sizeof(char));
	if (!tentative_binary_path) {
		ret = -1;
		goto alloc_error;
	}

	curr_search_dir = command_search_path;
	do {
		/*
		 * Split on ':'. The return value of this call points to the
		 * matching character.
		 */
		curr_search_dir_end = strchr(curr_search_dir, ':');
		if (curr_search_dir_end != NULL) {
			/*
			 * Add a NULL byte to the end of the first token so it
			 * can be used as a string.
			 */
			curr_search_dir_end[0] = '\0';
		}

		/* Empty the tentative path */
		memset(tentative_binary_path, 0, LTTNG_PATH_MAX * sizeof(char));

		/*
		 * Build the tentative path to the binary using the current
		 * search directory and the name of the binary.
		 */
		ret = snprintf(tentative_binary_path, LTTNG_PATH_MAX, "%s/%s",
				curr_search_dir, binary);
		if (ret < 0) {
			goto free_binary_path;
		}
		if (ret < LTTNG_PATH_MAX) {
			 /*
			  * Use STAT(2) to see if the file exists.
			 */
			ret = stat(tentative_binary_path, &stat_output);
			if (ret == 0) {
				/*
				 * Verify that it is a regular file or a
				 * symlink and not a special file (e.g.
				 * device).
				 */
				if (S_ISREG(stat_output.st_mode)
						|| S_ISLNK(stat_output.st_mode)) {
					/*
					 * Found a match, set the out parameter
					 * and return success.
					 */
					ret = lttng_strncpy(binary_full_path,
							tentative_binary_path,
							LTTNG_PATH_MAX);
					if (ret == -1) {
						ERR("Source path does not fit "
							"in destination buffer.");
					}
					goto free_binary_path;
				}
			}
		}
		/* Go to the next entry in the $PATH variable. */
		curr_search_dir = curr_search_dir_end + 1;
	} while (curr_search_dir_end != NULL);

free_binary_path:
	free(tentative_binary_path);
alloc_error:
	free(command_search_path);
end:
	return ret;
}

/*
 * Check if the symbol field passed by the user is in fact an address or an
 * offset from a symbol. Those two instrumentation types are not supported yet.
 * It's expected to be a common mistake because of the existing --probe option
 * that does support these formats.
 *
 * Here are examples of these unsupported formats for the --userspace-probe
 * option:
 * elf:/path/to/binary:0x400430
 * elf:/path/to/binary:4194364
 * elf:/path/to/binary:my_symbol+0x323
 * elf:/path/to/binary:my_symbol+43
 */
static
int warn_userspace_probe_syntax(const char *symbol)
{
	int ret;

	/* Check if the symbol field is an hex address. */
	ret = sscanf(symbol, "0x%*x");
	if (ret > 0) {
		/* If there is a match, print a warning and return an error. */
		ERR("Userspace probe on address not supported yet.");
		ret = CMD_UNSUPPORTED;
		goto error;
	}

	/* Check if the symbol field is an decimal address. */
	ret = sscanf(symbol, "%*u");
	if (ret > 0) {
		/* If there is a match, print a warning and return an error. */
		ERR("Userspace probe on address not supported yet.");
		ret = CMD_UNSUPPORTED;
		goto error;
	}

	/* Check if the symbol field is symbol+hex_offset. */
	ret = sscanf(symbol, "%*[^+]+0x%*x");
	if (ret > 0) {
		/* If there is a match, print a warning and return an error. */
		ERR("Userspace probe on symbol+offset not supported yet.");
		ret = CMD_UNSUPPORTED;
		goto error;
	}

	/* Check if the symbol field is symbol+decimal_offset. */
	ret = sscanf(symbol, "%*[^+]+%*u");
	if (ret > 0) {
		/* If there is a match, print a warning and return an error. */
		ERR("Userspace probe on symbol+offset not supported yet.");
		ret = CMD_UNSUPPORTED;
		goto error;
	}

	ret = 0;

error:
	return ret;
}

/*
 * Parse userspace probe options
 * Set the userspace probe fields in the lttng_event struct and set the
 * target_path to the path to the binary.
 */
int parse_userspace_probe_opts(const char *opt,
		struct lttng_userspace_probe_location **probe_location)
{
	int ret = CMD_SUCCESS;
	size_t num_token = 0;
	char *target_path = NULL;
	char *unescaped_target_path = NULL;
	char *real_target_path = NULL;
	char *symbol_name = NULL, *probe_name = NULL, *provider_name = NULL;
	struct lttng_userspace_probe_location *probe_location_local = NULL;
	struct lttng_userspace_probe_location_lookup_method *lookup_method = NULL;
	struct lttng_dynamic_pointer_array tokens;

	LTTNG_ASSERT(opt);

	/*
	 * userspace probe fields are separated by ':'.
	 */
	ret = strutils_split(opt, ':', true, &tokens);
	if (ret == 0) {
		num_token = lttng_dynamic_pointer_array_get_count(&tokens);
	}

	/*
	 * Early sanity check that the number of parameter is between 2 and 4
	 * inclusively.
	 * elf:PATH:SYMBOL
	 * std:PATH:PROVIDER_NAME:PROBE_NAME
	 * PATH:SYMBOL (same behavior as ELF)
	 */
	if (ret < 0 || num_token < 2 || num_token > 4) {
		ret = CMD_ERROR;
		goto end;
	}

	/*
	 * Looking up the first parameter will tell the technique to use to
	 * interpret the userspace probe/function description.
	 */
	switch (num_token) {
	case 2:
		/* When the probe type is omitted we assume ELF for now. */
	case 3:
		if (num_token == 3 && strcmp((const char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 0), "elf") == 0) {
			target_path = (char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 1);
			symbol_name = (char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 2);
		} else if (num_token == 2) {
			target_path = (char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 0);
			symbol_name = (char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 1);
		} else {
			ret = CMD_ERROR;
			goto end;
		}
		lookup_method =
			lttng_userspace_probe_location_lookup_method_function_elf_create();
		if (!lookup_method) {
			WARN("Failed to create ELF lookup method");
			ret = CMD_ERROR;
			goto end;
		}
		break;
	case 4:
		if (strcmp((const char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 0), "sdt") == 0) {
			target_path = (char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 1);
			provider_name = (char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 2);
			probe_name = (char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 3);
		} else {
			ret = CMD_ERROR;
			goto end;
		}
		lookup_method =
			lttng_userspace_probe_location_lookup_method_tracepoint_sdt_create();
		if (!lookup_method) {
			WARN("Failed to create SDT lookup method");
			ret = CMD_ERROR;
			goto end;
		}
		break;
	default:
		ret = CMD_ERROR;
		goto end;
	}

	/* strutils_unescape_string allocates a new char *. */
	unescaped_target_path = strutils_unescape_string(target_path, 0);
	if (!unescaped_target_path) {
		ret = CMD_ERROR;
		goto end;
	}

	/*
	 * If there is not forward slash in the path. Walk the $PATH else
	 * expand.
	 */
	if (strchr(unescaped_target_path, '/') == NULL) {
		/* Walk the $PATH variable to find the targeted binary. */
		real_target_path = (char *) zmalloc(LTTNG_PATH_MAX * sizeof(char));
		if (!real_target_path) {
			PERROR("Error allocating path buffer");
			ret = CMD_ERROR;
			goto end;
		}
		ret = walk_command_search_path(unescaped_target_path, real_target_path);
		if (ret) {
			ERR("Binary not found.");
			ret = CMD_ERROR;
			goto end;
		}
	} else {
		/*
		 * Expand references to `/./` and `/../`. This function does not check
		 * if the file exists. This call returns an allocated buffer on
		 * success.
		 */
		real_target_path = utils_expand_path_keep_symlink(unescaped_target_path);
		if (!real_target_path) {
			ERR("Error expanding the path to binary.");
			ret = CMD_ERROR;
			goto end;
		}

		/*
		 * Check if the file exists using access(2), If it does not,
		 * return an error.
		 */
		ret = access(real_target_path, F_OK);
		if (ret) {
			ERR("Cannot find binary at path: %s.", real_target_path);
			ret = CMD_ERROR;
			goto end;
		}
	}

	switch (lttng_userspace_probe_location_lookup_method_get_type(lookup_method)) {
	case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
		/*
		 * Check for common mistakes in userspace probe description syntax.
		 */
		ret = warn_userspace_probe_syntax(symbol_name);
		if (ret) {
			goto end;
		}

		probe_location_local = lttng_userspace_probe_location_function_create(
				real_target_path, symbol_name, lookup_method);
		if (!probe_location_local) {
			WARN("Failed to create function probe location");
			ret = CMD_ERROR;
			goto end;
		}

		/* Ownership transferred to probe_location. */
		lookup_method = NULL;
		break;
	case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT:
		probe_location_local = lttng_userspace_probe_location_tracepoint_create(
				real_target_path, provider_name, probe_name, lookup_method);
		if (!probe_location_local) {
			WARN("Failed to create function probe location");
			ret = CMD_ERROR;
			goto end;
		}

		/* Ownership transferred to probe_location. */
		lookup_method = NULL;
		break;
	default:
		ret = CMD_ERROR;
		goto end;
	}

	/*
	 * Everything went fine, transfer ownership of probe location to
	 * caller.
	 */
	*probe_location = probe_location_local;
	probe_location_local = NULL;

end:
	lttng_userspace_probe_location_destroy(probe_location_local);
	lttng_userspace_probe_location_lookup_method_destroy(lookup_method);
	lttng_dynamic_pointer_array_reset(&tokens);
	/*
	 * Freeing both char * here makes the error handling simplier. free()
	 * performs not action if the pointer is NULL.
	 */
	free(real_target_path);
	free(unescaped_target_path);

	return ret;
}
Commit	Line	Data
0c4e727b JR	1	/*
	2	* Copyright (C) 2020 EfficiOS, Inc.
	3	*
	4	* SPDX-License-Identifier: GPL-2.0-only
	5	*
	6	*/
	7
	8	#include "uprobe.h"
	9
	10	#include <sys/types.h>
	11	#include <sys/stat.h>
	12	#include <unistd.h>
	13
	14	#include "common/compat/getenv.h"
	15	#include "common/string-utils/string-utils.h"
	16	#include "common/utils.h"
	17	#include "lttng/constant.h"
	18
	19	#include "command.h"
	20
	21	/*
	22	* Walk the directories in the PATH environment variable to find the target
	23	* binary passed as parameter.
	24	*
	25	* On success, the full path of the binary is copied in binary_full_path out
	26	* parameter. This buffer is allocated by the caller and must be at least
	27	* LTTNG_PATH_MAX bytes long.
	28	* On failure, returns -1;
	29	*/
	30	static
	31	int walk_command_search_path(const char binary, char binary_full_path)
	32	{
	33	char *tentative_binary_path = NULL;
	34	char *command_search_path = NULL;
	35	char *curr_search_dir_end = NULL;
	36	char *curr_search_dir = NULL;
	37	struct stat stat_output;
	38	int ret = 0;
	39
	40	command_search_path = lttng_secure_getenv("PATH");
	41	if (!command_search_path) {
	42	ret = -1;
	43	goto end;
	44	}
	45
	46	/*
	47	* Duplicate the $PATH string as the char pointer returned by getenv() should
	48	* not be modified.
	49	*/
	50	command_search_path = strdup(command_search_path);
	51	if (!command_search_path) {
	52	ret = -1;
	53	goto end;
	54	}
	55
	56	/*
	57	* This char array is used to concatenate path to binary to look for
	58	* the binary.
	59	*/
48a40005	60	tentative_binary_path = (char ) zmalloc(LTTNG_PATH_MAX sizeof(char));
0c4e727b JR	61	if (!tentative_binary_path) {
	62	ret = -1;
	63	goto alloc_error;
	64	}
	65
	66	curr_search_dir = command_search_path;
	67	do {
	68	/*
	69	* Split on ':'. The return value of this call points to the
	70	* matching character.
	71	*/
	72	curr_search_dir_end = strchr(curr_search_dir, ':');
	73	if (curr_search_dir_end != NULL) {
	74	/*
	75	* Add a NULL byte to the end of the first token so it
	76	* can be used as a string.
	77	*/
	78	curr_search_dir_end[0] = '\0';
	79	}
	80
	81	/* Empty the tentative path */
	82	memset(tentative_binary_path, 0, LTTNG_PATH_MAX * sizeof(char));
	83
	84	/*
	85	* Build the tentative path to the binary using the current
	86	* search directory and the name of the binary.
	87	*/
	88	ret = snprintf(tentative_binary_path, LTTNG_PATH_MAX, "%s/%s",
	89	curr_search_dir, binary);
	90	if (ret < 0) {
	91	goto free_binary_path;
	92	}
	93	if (ret < LTTNG_PATH_MAX) {
	94	/*
	95	* Use STAT(2) to see if the file exists.
	96	*/
	97	ret = stat(tentative_binary_path, &stat_output);
	98	if (ret == 0) {
	99	/*
	100	* Verify that it is a regular file or a
	101	* symlink and not a special file (e.g.
	102	* device).
	103	*/
	104	if (S_ISREG(stat_output.st_mode)
	105	\|\| S_ISLNK(stat_output.st_mode)) {
	106	/*
	107	* Found a match, set the out parameter
	108	* and return success.
	109	*/
	110	ret = lttng_strncpy(binary_full_path,
	111	tentative_binary_path,
	112	LTTNG_PATH_MAX);
	113	if (ret == -1) {
	114	ERR("Source path does not fit "
	115	"in destination buffer.");
	116	}
	117	goto free_binary_path;
	118	}
	119	}
	120	}
	121	/* Go to the next entry in the $PATH variable. */
	122	curr_search_dir = curr_search_dir_end + 1;
	123	} while (curr_search_dir_end != NULL);
	124
125	free_binary_path:
126	free(tentative_binary_path);
127	alloc_error:
128	free(command_search_path);
129	end:
130	return ret;
131	}
132
133	/*
134	* Check if the symbol field passed by the user is in fact an address or an
135	* offset from a symbol. Those two instrumentation types are not supported yet.
136	* It's expected to be a common mistake because of the existing --probe option
137	* that does support these formats.
138	*
139	* Here are examples of these unsupported formats for the --userspace-probe
140	* option:
141	* elf:/path/to/binary:0x400430
142	* elf:/path/to/binary:4194364
143	* elf:/path/to/binary:my_symbol+0x323
144	* elf:/path/to/binary:my_symbol+43
145	*/
146	static
147	int warn_userspace_probe_syntax(const char *symbol)
148	{
149	int ret;
150
151	/* Check if the symbol field is an hex address. */
152	ret = sscanf(symbol, "0x%*x");
153	if (ret > 0) {
154	/* If there is a match, print a warning and return an error. */
155	ERR("Userspace probe on address not supported yet.");
156	ret = CMD_UNSUPPORTED;
157	goto error;
158	}
159
160	/* Check if the symbol field is an decimal address. */
161	ret = sscanf(symbol, "%*u");
162	if (ret > 0) {
163	/* If there is a match, print a warning and return an error. */
164	ERR("Userspace probe on address not supported yet.");
165	ret = CMD_UNSUPPORTED;
166	goto error;
167	}
168
169	/* Check if the symbol field is symbol+hex_offset. */
170	ret = sscanf(symbol, "%[^+]+0x%x");
171	if (ret > 0) {
172	/* If there is a match, print a warning and return an error. */
173	ERR("Userspace probe on symbol+offset not supported yet.");
174	ret = CMD_UNSUPPORTED;
175	goto error;
176	}
177
178	/* Check if the symbol field is symbol+decimal_offset. */
179	ret = sscanf(symbol, "%[^+]+%u");
180	if (ret > 0) {
181	/* If there is a match, print a warning and return an error. */
182	ERR("Userspace probe on symbol+offset not supported yet.");
183	ret = CMD_UNSUPPORTED;
184	goto error;
185	}
186
187	ret = 0;
188
189	error:
190	return ret;
191	}
192
193	/*
194	* Parse userspace probe options
195	* Set the userspace probe fields in the lttng_event struct and set the
196	* target_path to the path to the binary.
197	*/
0c4e727b JR	198	int parse_userspace_probe_opts(const char *opt,
	199	struct lttng_userspace_probe_location **probe_location)
	200	{
	201	int ret = CMD_SUCCESS;
e358ddd5	202	size_t num_token = 0;
0c4e727b JR	203	char *target_path = NULL;
	204	char *unescaped_target_path = NULL;
	205	char *real_target_path = NULL;
	206	char symbol_name = NULL, probe_name = NULL, *provider_name = NULL;
	207	struct lttng_userspace_probe_location *probe_location_local = NULL;
	208	struct lttng_userspace_probe_location_lookup_method *lookup_method = NULL;
e358ddd5	209	struct lttng_dynamic_pointer_array tokens;
0c4e727b	210
a0377dfe	211	LTTNG_ASSERT(opt);
0c4e727b JR	212
	213	/*
	214	* userspace probe fields are separated by ':'.
	215	*/
e358ddd5 JG	216	ret = strutils_split(opt, ':', true, &tokens);
	217	if (ret == 0) {
	218	num_token = lttng_dynamic_pointer_array_get_count(&tokens);
	219	}
0c4e727b JR	220
	221	/*
	222	* Early sanity check that the number of parameter is between 2 and 4
	223	* inclusively.
	224	* elf:PATH:SYMBOL
	225	* std:PATH:PROVIDER_NAME:PROBE_NAME
	226	* PATH:SYMBOL (same behavior as ELF)
	227	*/
e358ddd5	228	if (ret < 0 \|\| num_token < 2 \|\| num_token > 4) {
0c4e727b JR	229	ret = CMD_ERROR;
	230	goto end;
	231	}
	232
	233	/*
	234	* Looking up the first parameter will tell the technique to use to
	235	* interpret the userspace probe/function description.
	236	*/
	237	switch (num_token) {
	238	case 2:
	239	/* When the probe type is omitted we assume ELF for now. */
	240	case 3:
48a40005 SM	241	if (num_token == 3 && strcmp((const char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 0), "elf") == 0) {
	242	target_path = (char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 1);
	243	symbol_name = (char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 2);
0c4e727b	244	} else if (num_token == 2) {
48a40005 SM	245	target_path = (char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 0);
48a40005 SM	246	symbol_name = (char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 1);
0c4e727b JR	247	} else {
	248	ret = CMD_ERROR;
	249	goto end;
	250	}
	251	lookup_method =
	252	lttng_userspace_probe_location_lookup_method_function_elf_create();
	253	if (!lookup_method) {
	254	WARN("Failed to create ELF lookup method");
	255	ret = CMD_ERROR;
	256	goto end;
	257	}
	258	break;
	259	case 4:
48a40005 SM	260	if (strcmp((const char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 0), "sdt") == 0) {
	261	target_path = (char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 1);
	262	provider_name = (char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 2);
	263	probe_name = (char *) lttng_dynamic_pointer_array_get_pointer(&tokens, 3);
0c4e727b JR	264	} else {
	265	ret = CMD_ERROR;
	266	goto end;
	267	}
	268	lookup_method =
	269	lttng_userspace_probe_location_lookup_method_tracepoint_sdt_create();
	270	if (!lookup_method) {
	271	WARN("Failed to create SDT lookup method");
	272	ret = CMD_ERROR;
	273	goto end;
	274	}
	275	break;
	276	default:
	277	ret = CMD_ERROR;
	278	goto end;
	279	}
	280
	281	/* strutils_unescape_string allocates a new char . /
	282	unescaped_target_path = strutils_unescape_string(target_path, 0);
	283	if (!unescaped_target_path) {
	284	ret = CMD_ERROR;
	285	goto end;
	286	}
	287
	288	/*
	289	* If there is not forward slash in the path. Walk the $PATH else
	290	* expand.
	291	*/
	292	if (strchr(unescaped_target_path, '/') == NULL) {
	293	/* Walk the $PATH variable to find the targeted binary. */
48a40005	294	real_target_path = (char ) zmalloc(LTTNG_PATH_MAX sizeof(char));
0c4e727b JR	295	if (!real_target_path) {
	296	PERROR("Error allocating path buffer");
	297	ret = CMD_ERROR;
	298	goto end;
	299	}
	300	ret = walk_command_search_path(unescaped_target_path, real_target_path);
	301	if (ret) {
	302	ERR("Binary not found.");
	303	ret = CMD_ERROR;
	304	goto end;
	305	}
	306	} else {
	307	/*
	308	* Expand references to `/./` and `/../`. This function does not check
	309	* if the file exists. This call returns an allocated buffer on
	310	* success.
	311	*/
	312	real_target_path = utils_expand_path_keep_symlink(unescaped_target_path);
	313	if (!real_target_path) {
	314	ERR("Error expanding the path to binary.");
	315	ret = CMD_ERROR;
	316	goto end;
	317	}
	318
	319	/*
	320	* Check if the file exists using access(2), If it does not,
	321	* return an error.
	322	*/
	323	ret = access(real_target_path, F_OK);
	324	if (ret) {
	325	ERR("Cannot find binary at path: %s.", real_target_path);
	326	ret = CMD_ERROR;
	327	goto end;
	328	}
	329	}
	330
	331	switch (lttng_userspace_probe_location_lookup_method_get_type(lookup_method)) {
	332	case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
	333	/*
	334	* Check for common mistakes in userspace probe description syntax.
	335	*/
	336	ret = warn_userspace_probe_syntax(symbol_name);
	337	if (ret) {
	338	goto end;
	339	}
	340
	341	probe_location_local = lttng_userspace_probe_location_function_create(
	342	real_target_path, symbol_name, lookup_method);
	343	if (!probe_location_local) {
	344	WARN("Failed to create function probe location");
	345	ret = CMD_ERROR;
	346	goto end;
	347	}
	348
	349	/* Ownership transferred to probe_location. */
	350	lookup_method = NULL;
	351	break;
	352	case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT:
	353	probe_location_local = lttng_userspace_probe_location_tracepoint_create(
	354	real_target_path, provider_name, probe_name, lookup_method);
	355	if (!probe_location_local) {
	356	WARN("Failed to create function probe location");
	357	ret = CMD_ERROR;
	358	goto end;
359	}
360
361	/* Ownership transferred to probe_location. */
362	lookup_method = NULL;
363	break;
364	default:
365	ret = CMD_ERROR;
366	goto end;
367	}
368
369	/*
370	* Everything went fine, transfer ownership of probe location to
371	* caller.
372	*/
373	*probe_location = probe_location_local;
374	probe_location_local = NULL;
375
376	end:
377	lttng_userspace_probe_location_destroy(probe_location_local);
378	lttng_userspace_probe_location_lookup_method_destroy(lookup_method);
e358ddd5	379	lttng_dynamic_pointer_array_reset(&tokens);
0c4e727b JR	380	/*
	381	* Freeing both char * here makes the error handling simplier. free()
	382	* performs not action if the pointer is NULL.
	383	*/
	384	free(real_target_path);
	385	free(unescaped_target_path);
	386
	387	return ret;
	388	}